John m



(No Model.)

J. M. LAGI- ILAN.

STEAM BOILER.

ATTORNEYS.

NIPEYERS. Phnln-Lifiwgnpher. Washington, 0. c,

N-ITED ST TES PATE T OFFICE.

JOHN M. LAC-I-ILAN, on NEW YORK, N. Y. 1

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 414,911, dated November12, 1889.

Application filed May 8, 1889. Serial No. 310,024- (NomodeL) tion.

My invention relates to marine and stationary boilers whereincirculating-pipes are employed in the fire-box and also in the water-space at the bottom of the boiler below the ash-pit; and myinvention consists in the construction and combination of parts, ashereinafter described and claimed, whereby reliable and eifectivecirculation is produced and the circulation is placed under easy andquick control of the engineer or fireman.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, inwhich similar letters of reference indicatecorresponding parts in all the figures. I

Figure 1 is a sectional side elevation of a boiler having myinventionapplied thereto. Fig. 2 is a sectional plan view of the same. Fig. 3 isa perspective View of one of the pipe-couplings. Fig. 4is a reducedsectional plan view of the same. Fig. 5 is an enlarged view of the valveat the inner end of the stand-pipe.

B represents the ordinary boiler-shell; O, the tubes; and D thefire-box, containing the grate-bars E in the usual manner. In the spaceG are placed the stand-pipes H, which are bent and their upper endspassed through the tube-plate I into the water-space J of the boilerabove the tubes. The lower ends of the said stand-pipes are eachprovided with a coupling K, formed with a single neck It to receive thestand-pipeH. Immediately in line with the neck is is formed the, neck Itto receive the central heating or circulating pipe L. At each side ofthe neck It is formed a curved branch 70 to receive the side heating orcirculating pipes M M. The front ends of the said heating or circulatingpipes are fitted in a coupling N, having central coincident necks n nand curved side branches n 71 and this coupling connects the heating orcirculating pipes with a pipe 0, which passes out to the front of theboiler and then inward therethrough, where it is connected to the pipeP, which leads into the water-space the pipes O P' and couplings Nintothe heat- Y ing and circulating pipes L M, thence through the couplingsK and stand-pipes H to the water-space either above or below thewaterline, as may be deemed desirable in practice. The current from thepipe 0 to the standpipe H, being direct through the central necks it nand central pipe L, meets the minimum of resistance or obstruction,which would not be the case if all the water were forced to pass throughthe two side pipes M and the curved side branches of the couplings.

The upper end of the stand-pipe H is provided with a valve H,constructed to receive a gate h. The passage h in the valve whichreceives the gate h is open at the bottom at W, so that clogging of thevalve is impossible and there is no interference with its freeoperation. To the upper end of the gate h is attached the rod h whichpasses through the stuffing-box h, and is connected to one arm of thebell-crank lever h pivoted in a standard at the top of the boiler. Tothe other arm of the bell-crank lever is attached the operating-rod M,which reaches to the front of the boiler, where it can be easily reachedand instantly operated for closing the cock. In that portion of each ofthe pipes O at the front of the boiler. is fitted a gatevalve 0, adaptedfor instant operation for closing the said pipes.

The pipes P in the space below the ash-pit are each formed with abell-mouth 10, over which wire-cloth p is placed to prevent clogging,and numerous holes 10 are formed in the sides of the pipes to admitWater to the interior of all the line of the pipe.

Having thus described my invention, What I 5 claim as new, and desire tosecure by Letters Patent, is-

The stand-pipe H, entering the boiler, in combination with the valve11', having opening 7L2 and gate h, and the rod 715', bell-crank h, andoperating-rod h, substantially as de- 10 scribed.

JOHN M. LACHLAN.

Witnesses:

F. O. MCOULLOGH, F. A. DBREMEN.

